Machine for grinding the interiors of hollow bodies.



L. BILLE'.

MACHINE FDR GRINDING THE INTERIORS 0F HOLLOW BODIES.

APPLECATIGN HLED MAR. 31. 1911.

1,271,837. Patented July .9, 1918.

Inventor.

- the fol LEON BILLE, or NOGENT-SUB-MABNE, FRANCE.

MACHINE FOR GRINDING THE INTERIORS OF HOLLOW BODIES.

' Specification of Letters latent.

Patented Jul 9, 1918.

Application filed March 31, 1917. Serial No. 158,812.

To all whom it may concern:

Be it known that 1, Lion BJLLE', engi necr, of 37 Grandc Rue, at Nogent-sur- Marne, De )antment of the Seine, France, citizen of t e French Republic, have invented certain new and useful Improvements in Machines for Grinding the Interiors ofi Hollow Bodies; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will en able others skilled in the art to which it appertains to make and use the same.

The present invention has for its ob'ect a machine for grinding the interiors o holloW bodies such as shells and the like which permits internal defects to be removed after they have been marked externally with chalk or by other means.

A. machine of this kind constructed according to the present invention possesses owing advantages:

1. Possibility of rotating the grinding wheels between six thousand and twelve thousand turns per minute, that is to say, at the maximum speeds which the strength of the wheels permits.

2. The grinding wheel can be pressed on the surface to be ground much as is necessary for rapid work and can be withdrawn from this surface as soon as the work is finished.

3. Perfect guidance of the grinding wheel which exactly and closely follows an we terior guide.

4. The workman has nothing else to do but to cause the grinding wheel to engage with'the internal wall of the shell and to give a reciprocating movement to the carriage on which the grinding wheel is mounted.

5. All the interior parts of a shell can be ground, as the arm carrying the grinding wheel can be altered in direction over a wide area and the shell can be brought into the desired position by operating its cradle.

According to the invention the electric or petrol motor which operates the driving shaft of the grinding wheel is mounted on a carriage with two wheels rollingon rails fixed on a rotary table in such a manner that the arm can be brought into a series of predetermined positions. A guide lever is also firmly secured to the arm carrying the grinding wheel; it extends above the shell which it is desired to render true and is provided with an index showing the position dle is moved by reason of. the balqiieing of the device. The shell itself may be carried on a cradle with rollers for large shells, or by the worlnnan in the case of those of small dimensions.

The accompanying drawings show by Way of example different methods of carrying out the invention.

Figure 1 is avertical section of,,an ap paratus constructed, in accordance with t \e invention.

Fig. 2 is a plan view of the same.

Fig. 3 shows a pair of calipers used for marking the defects.

Fig. 4 is a vertical section of a modified machine for working on shells of small diameter.

In the arrangements shown in Fig. 1 the shell is indicated at 1, the grinding wheel,

which may be of corundum, emery or, carborundum, is shown at 2, and 3 is a. tube or sleeve in which the shaft carryin the grinding wheel rotates. The end o this shaft provided with a pulley 4.- which is driven by an electric or petrol motor shown at 5, and if necessary provided with a rheostat- 6. The whole is mounted on a carriage 7 with two grooved wheels which roll on the rails 9 of a. rotatable table 8.

The shell is carried on a cradle shown at 10 by two rollers 11, the, cradle being adjusted by means of screws 12 by which the height hnd inclination of the cradle and the shell may be varied. These screws are fixed in the table 13 supporting the whole of the machine.

The guide 14 is firmly secured on the arm 3 Which carries the grindingwheel and is supported by stays 15 for stifienin purposes. This arm also carries the in ex 16 for indicating the exact position of the grinding wheel inside the shell, 17. is a handle fixed on the guide arm and serving to move the arm carrying the grinding wheel.

The operation of the device is as follows:

The internal defects of the shell are first ascertained by means of the calipers shown thecradle 10. The four rollers permit the shell to be easily rotated. The workman by means of the handle 17 of the guide arm ll causes the grinding wheel. to move inside the shell until it is exactly opposite one of the defects to be removed, this being shown by the index 16. This index can be turned out of the way by rotation on the arm 1t when the rinding wheel is operating on the base of tfie shell oppositethe month. By raising the handle of the guide arm the workman can press the hiding Wheel against the interior of the s ell as, strongly as he pleases, and by moving the handle and with it the grinding wheel and its carriage to and fro the interior of a shell 'can be trued up and finished at any part, or if necessary all over its surface, and by employing grinding wheels of suitable form also the inside of the base opposite the opening.

An desired number of cradles for shells may e irovidehbut referably three are employe as shown in ig. 2,'so that at the same time a shell can be placed on one car riage, a ground shell can be moved from another carria and the rindin of another shell can talg place on t e thir carriage.

For shells of small and medium caliber which are not too heavy to be supported by hand during grinding the apparatus is simplified, as shown in Fig. i. The rotary table and cradles carrying the shells are dispensed with and the handle of the guide arm becomes unnecessary; The grinding apparatus is fixed but the arm carrying the grinding Wheel can be oscillated in a vertical plane about an axis 19 and is automatirally returned into position by a spring 20 attached at the end of a ring surrounding the arm. The armcarryin r the grinding wheel can be guided vertical y by means of a fork. 21. This arrangement is designed to avoid breaking the shaft of the grinding wheel when the workman applies the shell too heavily to the wheel.

Machines constructed in accordance with this invention enable. the work to be done very quickly and a large output to be obteined, even with shells of large calibers, by using several cradles for carrying the shells round the grinding apparatus and by mounting the latter on a rotary table, which permits the grinding wheels to Work constantly on a shell during the placing of a shell in position and removal of the neighboring shells.

Moreover, as the carriage of the apparatus is balanced the workman has only to apply the grinding wheel to the interior of the shell and to move the carriage.

Finally the whole of the internal parts of the shell can be ground, the shell can rotate on the rollers of the sln-lt-currying cradle and these rollers can be given the required height and inclinati n by nu-uns of the ud justing screws, the carriage carrying the grinding apparatus can be moved forward I or backward, and the arm carrying the grinding wheel can be directed into all the positions necessary, so that the grinding wheel can touch every part of the inside of the shell.

I claim 1. In a machine of the class described, the combination with a vertically and horizontally movable supporhof a grinding tool shaft extending therefrom, a tool on the end of the shaft, a handle extending from the support and having an indicator mounted thereon which is alined with the tool.

2. In a machine of the class described, the combination with a vertically and horizontally movable support, of a grinding tool shaft extending therefrom, a tool on the end of said shaft, and a handle extending from the support by means of which lhc latter may be moved either in a vertical or horizonial direction.

3. In a machine of the class described, the combination with a vertically and horizontally movable support, of a grinding tool shaft extending therefrom, a grinding tool on the end of said shaft, and a handle scoured to and extending from the support Substantially parallel to the tool shaft.

4. In a machine of the class described, the combination with a movable support, of a tool shaft extending therefrom, a tool mounted on the end of said shaft, a handle extending from the support and having a grip portion adjncent to, the end of the.tool shaft. i

5, In a machine of the class described, the combination with a vertically and. horizontally movable carriage, of a tool shaft extending therefrom, a tool mounted on the end of said shaft and a work support comprising supporting elements, and means for LEON BILLE.

Witnesses:

Cnas. I. Pnnssny, HENRI/COHEN. i 

